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Author
- National Atlas of the United States53
- Geological Survey (U.S.)33
- Cao, Changyong12
- Earle, Carville12
- Heppen, John12
- Louisiana State University (Baton Rouge, La.). Department of Geography and Anthropology.12
- Otterstrom, Samuel12
- Arndt, Raymond E.10
- Bawiec, Walter J.10
- Beikman, Helen M.10
- King, Philip B.10
- National Geophysical Data Center10
- Schruben, Paul G.10
- Geological Survey (U.S.) Minerals Information Team9
- Platts9
- EROS Data Center3
- Godt, Jonathan W.3
- U.S. Geological Survey2
- United States. Forest Service2
- Wade, Tim2